export default {
  namespaced: true,



  state: () => ({
    // 购物车的数组，用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象，都包含如下6个属性：
    // {gods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_state}
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  // 模块的 mutations 方法
  mutations: {
    addToCart(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      // console.log(findResult);
      // 判断购物车里面是否有这件商品
      if (!findResult) {
        state.cart.push(goods)
      } else {
        findResult.goods_count++
      }
      // console.log(state.cart);
      this.commit('m_cart/saveToStorage')
    },
    // 购物车中的数据持久化存储到本地
    saveToStorage(state) {
      uni.setStorageSync('cart', JSON.stringify(state.cart))
    },
    // 更新购物车中商品的勾选状态
    updateGoodsState(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        // 如果有 赋值并保存到本地
        findResult.goods_state = goods.goods_state
        this.commit('m_cart/saveToStorage')
      }
    },
    // 更新商品的数量
    updateGoodsCount(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        findResult.goods_count = goods.goods_count
        this.commit('m_cart/saveToStorage')
      }
    },
    // 根据 id 删除对应的商品
    removeGoodsById(state, goods_id) {
      state.cart = state.cart.filter(x => x.goods_id !== goods_id)
      this.commit('m_cart/saveToStorage')
    },
    // 更新购物车中所有商品的勾选状态
    updateAllGoodsState(state, newState) {
      state.cart.forEach(x => x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  // 模块的 getters 属性
  getters: {
    // 购物车中所有的总数量
    total(state) {
      // let num = 0
      // state.cart.forEach(x => num += x.goods_count)
      // return num
      return state.cart.reduce((total, item) => total += item.goods_count, 0)
    },
    // 购物车中已勾选的总数量
    checkedCount(state) {
      return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
    },
    // 购物车已勾选的总价
    checkedGoodsAmount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count * item.goods_price,0).toFixed(2)
    }
  },

}
